syzbot


WARNING in cfg80211_rehash_bss

Status: upstream: reported C repro on 2025/08/13 21:57
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+dc6f4dce0d707900cdea@syzkaller.appspotmail.com
First crash: 156d, last: 21d
Discussions (3)
Title Replies (including bot) Last reply
[syzbot] [wireless?] WARNING in cfg80211_rehash_bss 0 (2) 2025/09/16 08:54
Re: [PATCH v2 RFC 0/7] KFuzzTest: a new kernel fuzzing framework 1 (1) 2025/09/10 15:59
Re: [PATCH] wifi: cfg80211: fix bss rbn double erase issue 1 (1) 2025/09/05 08:11
Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/01/05 17:04 20m retest repro upstream OK log
2025/10/02 22:44 14m retest repro upstream report log

Sample crash report:
wlan1: authenticated
wlan1: associate with 08:02:11:00:00:00 (try 1/3)
wlan1: RX AssocResp from 08:02:11:00:00:00 (capab=0x1 status=0 aid=1)
wlan1: associated
wlan1: cannot understand ECSA IE operating class, 61, ignoring
wlan1: cannot understand ECSA IE operating class, 61, ignoring
------------[ cut here ]------------
WARNING: net/wireless/scan.c:1666 at rb_insert_bss net/wireless/scan.c:1666 [inline], CPU#0: kworker/u4:3/38
WARNING: net/wireless/scan.c:1666 at cfg80211_rehash_bss+0x1e6/0x540 net/wireless/scan.c:1723, CPU#0: kworker/u4:3/38
Modules linked in:
CPU: 0 UID: 0 PID: 38 Comm: kworker/u4:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:rb_insert_bss net/wireless/scan.c:1666 [inline]
RIP: 0010:cfg80211_rehash_bss+0x1e6/0x540 net/wireless/scan.c:1723
Code: e8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 33 03 00 00 ff 45 00 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 bc 03 b0 00 cc 90 <0f> 0b 90 4c 8b 2c 24 4c 89 ef e8 5b eb ea f9 84 c0 74 78 e8 e2 98
RSP: 0018:ffffc900009b6f20 EFLAGS: 00010246
RAX: ffffffff8aae6b25 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff88801eb3a4c0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88801234ec68 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000002 R12: ffff8880122481a0
R13: ffff88801234f830 R14: dffffc0000000000 R15: ffff888011f3b420
FS:  0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9c7a1ba190 CR3: 00000000354f0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 cfg80211_update_assoc_bss_entry+0x3fa/0x6a0 net/wireless/scan.c:3464
 cfg80211_ch_switch_notify+0x3c1/0x770 net/wireless/nl80211.c:20967
 ieee80211_sta_process_chanswitch+0xb05/0x2890 net/mac80211/mlme.c:-1
 ieee80211_rx_mgmt_beacon+0x1d6f/0x3230 net/mac80211/mlme.c:7569
 ieee80211_sta_rx_queued_mgmt+0x4ed/0x4520 net/mac80211/mlme.c:8142
 ieee80211_iface_process_skb net/mac80211/iface.c:1733 [inline]
 ieee80211_iface_work+0x652/0x12d0 net/mac80211/iface.c:1790
 cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/22 17:03 upstream 9448598b22c5 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/12 02:16 upstream d358e5254674 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/06 23:12 upstream 416f99c3b16f d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/12/04 03:21 upstream 3f9f0252130e d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/11/02 19:08 upstream 691d401c7e0e 2c50b6a9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/10/29 23:37 upstream e53642b87a4f fd2207e7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/09/18 22:08 upstream 8b789f2b7602 e2beed91 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/09/16 08:53 upstream 46a51f4f5eda e2beed91 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/09/16 07:05 upstream 46a51f4f5eda e2beed91 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/08/19 02:37 upstream be48bcf004f9 52052143 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
2025/08/09 21:47 upstream c30a13538d9f 32a0e5ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in cfg80211_rehash_bss
* Struck through repros no longer work on HEAD.